Mysql

From Luke Jackson

Revision as of 01:08, 19 July 2016 (edit) Ljackson (Talk | contribs) (→Ucwords for Mysql) ← Previous diff		Current revision (04:11, 14 October 2016) (edit) Ljackson (Talk | contribs) (→Basic my.cnf)
Line 109:		Line 109:
	skip-name-resolve		skip-name-resolve
	default-storage-engine=innodb		default-storage-engine=innodb
		+	</pre>
		+
		+	'''ERROR 2006 (HY000) at line 1: MySQL server has gone away'''
		+
		+	set global max_allowed_packet=104857600
		+
		+	permanent set in my.cnf
		+
		+	max_allowed_packet = 128M
		+
		+	Macports
		+
		+	<pre>
		+	[mysqld]
		+	default-storage-engine=innodb
		+	innodb_file_per_table
		+	innodb_file_format = Barracuda
		+	collation-server = utf8_unicode_ci
		+	init-connect='SET NAMES utf8'
		+	character-set-server = utf8
		+	max_allowed_packet = 128M
		+
		+	[client]
		+	default-character-set=utf8
		+
		+	[mysql]
		+	default-character-set=utf8
	</pre>		</pre>

---

Current revision

Contents 1 Show Process List (Running Queries) 2 Show Global Variables/Status 3 Dump Specific Tables 4 Terminal Command Line 5 Echo Output Direct to Terminal 5.1 Show Table(s) 5.2 Show Columns/Fields 5.3 Export SQL as .TXT , .CSV 6 Backup All Databases 7 Dump Data and Structure 8 Dump Data Only 9 Dump Structure Only 10 Dump Specific Table 11 Select DB for Import 12 Extract Database from Dump File 13 Basic my.cnf 14 Queries 14.1 Random Data Generator 15 Ucwords for Mysql 16 Sources

Show Process List (Running Queries)

SHOW PROCESSLIST;
SHOW FULL PROCESSLIST;

Show Global Variables/Status

SHOW GLOBAL VARIABLES LIKE '%slow%';
SHOW GLOBAL VARIABLES LIKE 'innodb_buffer_pool_size';
SHOW GLOBAL STATUS LIKE 'Innodb%_page%';

SHOW TABLE STATUS;

Dump Specific Tables

mysqldump -u XXX -pXXX mydb t1 t2 t3 > mydb_tables.sql

Terminal Command Line

Echo Output Direct to Terminal

echo "SHOW GLOBAL VARIABLES LIKE 'innodb_buffer_pool_size';" | mysql -S /local/mysql/io85/mysql.sock io85

Show Table(s)

All Tables in Database

SELECT table_name AS "Tables",  round(((data_length + index_length) / 1024 / 1024), 2) "Size in MB"  FROM information_schema.TABLES  WHERE table_schema = "$DB_NAME" ORDER BY (data_length + index_length) DESC;

Single Table

SELECT table_name AS "Table", 
round(((data_length + index_length) / 1024 / 1024), 2) "Size in MB" 
FROM information_schema.TABLES 
WHERE table_schema = "$DB_NAME"
 AND table_name = "$TABLE_NAME";

Table Status

show table status from io85 WHERE name = "stored_action_parameters"\G

Compare Table Sizes (i.e. check status of copy)

show table status like 'user_prd_batch_data%';

Indexes

show indexes from user_prd_batch_data;

Show Columns/Fields

desc user_prd_batch_data;

or

show columns from user_prd_batch_data;

Export SQL as .TXT , .CSV

SELECT order_id,product_name,qty
FROM orders
INTO OUTFILE '/tmp/orders.csv'
FIELDS TERMINATED BY ','
ENCLOSED BY '"'
LINES TERMINATED BY '\n'

Backup All Databases

mysqldump -n --user=XXXX --password=XXXX --all-databases | gzip -c > server.sql.gz

Dump Data and Structure

mysqldump -u root -p --skip-add-drop-table --replace --skip-extended-insert --lock-tables io85_com | sed 's/CREATE TABLE/CREATE TABLE IF NOT EXISTS/g' > io85_com_full.sql

Dump Data Only

mysqldump -u root -p --no-create-info --skip-add-drop-table --replace --skip-extended-insert --lock-tables io85_com > data_dump.sql

Dump Structure Only

mysqldump -u root -p --no-data --skip-add-drop-table --replace --skip-extended-insert --lock-tables io85_com | sed 's/CREATE TABLE/CREATE TABLE IF NOT EXISTS/g' > schema_dump.sql

Dump Specific Table

mysqldump --no-create-info --skip-extended-insert io85 report_prd_ddd_stacks > dd.sql

Select DB for Import

mysql -u root -p --one-database db_to_restore < fulldump.sql

Extract Database from Dump File

sed -n '/^-- Current Database: `test`/,/^-- Current Database: `/p' fulldump.sql > test.sql

Basic my.cnf

[mysqld]
# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=0
skip_external_locking
#skip-networking
skip-name-resolve
default-storage-engine=innodb

ERROR 2006 (HY000) at line 1: MySQL server has gone away

set global max_allowed_packet=104857600

permanent set in my.cnf 

max_allowed_packet = 128M

Macports

[mysqld]
default-storage-engine=innodb
innodb_file_per_table
innodb_file_format = Barracuda
collation-server = utf8_unicode_ci
init-connect='SET NAMES utf8'
character-set-server = utf8
max_allowed_packet = 128M

[client]
default-character-set=utf8

[mysql]
default-character-set=utf8

Queries

Random Data Generator

INSERT INTO `plug_in_track_prd_location_scans` ( `emply_id`, `dept_id`, `order_id`, `trans_id`, `note`, `m_login`, `c_timestamp`) VALUES
( 11111, (ROUND(RAND() * (24-19) + 19)), NULL, (ROUND( RAND( ) * RAND( ) *9028982 )), NULL, 'ljackson', (NOW() - INTERVAL (ROUND(RAND() * (9-1) + 1)) DAY));

Ucwords for Mysql

DROP FUNCTION IF EXISTS proper;
SET GLOBAL  log_bin_trust_function_creators=TRUE;
DELIMITER |
CREATE FUNCTION proper( str VARCHAR(128) )
RETURNS VARCHAR(128)
BEGIN
  DECLARE c CHAR(1);
  DECLARE s VARCHAR(128);
  DECLARE i INT DEFAULT 1;
  DECLARE bool INT DEFAULT 1;
  DECLARE punct CHAR(17) DEFAULT ' ()[]{},.-_!@;:?/';
  SET s = LCASE( str );
  WHILE i < LENGTH( str ) DO 
    BEGIN
      SET c = SUBSTRING( s, i, 1 );
      IF LOCATE( c, punct ) > 0 THEN
        SET bool = 1;
      ELSEIF bool=1 THEN 
        BEGIN
          IF c >= 'a' AND c <= 'z' THEN 
            BEGIN
              SET s = CONCAT(LEFT(s,i-1),UCASE(c),SUBSTRING(s,i+1));
              SET bool = 0;
            END;
          ELSEIF c >= '0' AND c <= '9' THEN
            SET bool = 0;
          END IF;
        END;
      END IF;
      SET i = i+1;
    END;
  END WHILE;
  RETURN s;
END;
|
DELIMITER ;

Sources

• http://www.tech-recipes.com/rx/1475/save-mysql-query-results-into-a-text-or-csv-file/